Flexible rubbing wheel



April 22 1924. 1,491,521-

I v. DIRIENZO FLEXIBLE RUBBING- WHEEL Filed Aug. '7, 1922 Am I i I f :1 T I 43 I a fi/ iy fi QJAACZW Vincent Dirianzn I /7 /3 l7 %KVW 2 Patented Apr. 22, 1924-.

UNITED STATES VINCENTQDIR-IENZO, or MAD SON, WISCONSINJ l;

. E IJE I LERUBBI NG WH EL.

Application filed Aii fist 7,1922. Serial No. 580,186.

T 0 all whom it may concern Be it known that I, VINCENT DInIENzo, a citizen of the United States, and resident of Madison, in the county of Dane and State of Wisconsin, have invented certain new and useful Improvements in Flexible Rubbing \Vheels; and I do hereby declare that the following is a full, clear, and exact description thereof.

This invention relates to flexible rubbing wheels for polishing granite and marble.

It comprises an abrasive ring having a flexible rubbing surface, and which is attached to a polishing machine and used with emery.

The device eliminates need for a small wheel ring which is used to work the low and high spots when the stone is not level, and is also used on concave surfaces. The object is to keep the rings as level and rigid as possible when operating on smooth surfaces. hen used on uneven surfaces the hinged effect which is produced by the rings being split, permits the surface to conform closely to the surface to be worked. This results in the saving of considerable time, as the larger ringwheel covers a large area. The large wheel was heretofore used only in the starting operation of the rubbing process.

lVith the above and other objects in view which will appear as the description pro ceeds, the invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawing, is illustrated one complete example of the physical embodiment of the present invention con structed according to the best mode so far devised for the practical application of the principles thereof.

Figure lis a front elevation of the device.

Figure 2 is a plan thereof, parts being shown in section.

Figure 3 is a plan of a modification, and

Figure l is a detail of a section.

Disc 10 is provided with lugs 11 by which it is attachable to the polishing machine. It is provided with a number ofspaced perforations which receive bolts 12 which are threaded into sections 13. The bolts are enveloped by helical springs 14 maintaining the sections in spaced relation to the disc.

Between the head 15 and the surface of the disc, a washer 16 is interposed. Each of the sections is laterally extended to form ears 1717 projecting in opposite directions, the former being inwardly disposed towards the center of the wheel. The ear 17 of one section is secured to the ear 17 of a succeeding section by means of pivot 18. The formation of the ears is such that the section is substantially stepped in shape. The series of segments is shaped into a ring concentric with the disc 10.

In the preferred embodiment two rings are used, the inner one A being quite small and disposed concentrically with respect to the outer one B, which is spaced slightly therefrom. In the modification shown in Figure 3, the parts are in the main similar to that modification shown in the other figures, but the ears 1717 of the segments are not pivoted together.

Heretofore it has been the practice to use a small wheel on irregular surfaces, inasmuch as the polishing wheel would not reach into the depressions.

The invention is adapted to work on fiat surfaces, the springs 14 maintaining the rings in a condition of greater or lesser rigidity. \Vhen operating on uneven surfaces, the segmental character of the rings permits them to conform with the surface, thus a saving of time results, inasmuch as the larger wheel covers a greater area in a small period of time.

The device is used with emery, carborundum and other abrasives for polishing granite, marble and other like materials. By stepping the joints between the segments, or in other words, by providing ears 17-17, the direct break which may catch the edge of a polished stone in the polishing operation and break it; is eliminated. The segments are enabled to move more smoothly over the surface of the stone.

I claim:

1. In a device of the class described, the combination of a plurality of stepped sections, each of which has a rubbing surface, ears on said sections, said ears being rounded at their ends, said sections being connected by their ears to form a ring, and means maintaining said sections in position.

2. In a device of the class described, the combination of a plate having openings therein, bolts extending thru said openings,

sections secured to one end of said bolts, the other end of said bolts being provided With a head, and springs enveloping said bolts and spacing said sections from said plate.

3. The combination of a plate, a plurality of sections formed into a ring, a pair of ears disposed in opposite directions on each of said sections, the ear of one section being pivoted to the ear of the next succeeding section, means limiting the movement of said 10 sections away from said plate and resilient means interposed between said plate and said sections for maintaining said sections in spaced relation to said late.

In testimony that I c aim the foregoing I 15 have hereunto set my hand at Madison, in the county of Dane and State of Wisconsin.

' VINCENT DIRIENZO. 

